Income Taxes, Net Operating Losses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
State NOL carryforwards	890.4
Deferred tax asset for State NOL carryforwards	41.1
Deferred tax asset for Federal NOL carryforward (entities not on Federal return)	7.5
Federal
Operating Loss Carryforwards [Line Items]
Expiration of NOL carryforwards	between 2012 and 2031
State
Operating Loss Carryforwards [Line Items]
Expiration of NOL carryforwards	between 2012 and 2031

The tax effect as of the balance sheet date of the amount of excess of tax deductions over gross income in a year which cannot be used on the tax return of the country of domicile in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

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The tax effect as of the balance sheet date of the amount of excess of tax deductions over gross income in a year which cannot be used on the tax return of a state or local jurisdiction in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

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